1 /*
2 * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.code;
27
28 import java.util.*;
29
30 import javax.lang.model.SourceVersion;
31 import static javax.lang.model.SourceVersion.*;
32
33 import com.sun.tools.javac.jvm.Target;
34 import com.sun.tools.javac.resources.CompilerProperties.Errors;
35 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
36 import com.sun.tools.javac.util.*;
37 import com.sun.tools.javac.util.JCDiagnostic.Error;
38 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
39
40 import static com.sun.tools.javac.main.Option.*;
41
42 /** The source language version accepted.
43 *
44 * <p><b>This is NOT part of any supported API.
45 * If you write code that depends on this, you do so at your own risk.
46 * This code and its internal interfaces are subject to change or
47 * deletion without notice.</b>
48 */
49 public enum Source {
50 /** 1.0 had no inner classes, and so could not pass the JCK. */
51 // public static final Source JDK1_0 = new Source("1.0");
52
53 /** 1.1 did not have strictfp, and so could not pass the JCK. */
54 // public static final Source JDK1_1 = new Source("1.1");
55
56 /** 1.2 introduced strictfp. */
57 JDK1_2("1.2"),
58
59 /** 1.3 is the same language as 1.2. */
60 JDK1_3("1.3"),
61
62 /** 1.4 introduced assert. */
63 JDK1_4("1.4"),
64
65 /** 1.5 introduced generics, attributes, foreach, boxing, static import,
66 * covariant return, enums, varargs, et al. */
67 JDK5("5"),
68
69 /** 1.6 reports encoding problems as errors instead of warnings. */
70 JDK6("6"),
71
72 /** 1.7 introduced try-with-resources, multi-catch, string switch, etc. */
73 JDK7("7"),
74
75 /** 1.8 lambda expressions and default methods. */
76 JDK8("8"),
77
78 /** 1.9 modularity. */
79 JDK9("9"),
80
81 /** 1.10 local-variable type inference (var). */
82 JDK10("10"),
83
84 /** 1.11 local-variable syntax for lambda parameters */
85 JDK11("11"),
86
87 /** 12 covers the to be determined language features that will be added in JDK 12. */
88 JDK12("12");
89
90 private static final Context.Key<Source> sourceKey = new Context.Key<>();
91
92 public static Source instance(Context context) {
93 Source instance = context.get(sourceKey);
94 if (instance == null) {
95 Options options = Options.instance(context);
96 String sourceString = options.get(SOURCE);
97 if (sourceString != null) instance = lookup(sourceString);
98 if (instance == null) instance = DEFAULT;
99 context.put(sourceKey, instance);
100 }
101 return instance;
102 }
103
104 public final String name;
105
106 private static final Map<String,Source> tab = new HashMap<>();
107 static {
108 for (Source s : values()) {
109 tab.put(s.name, s);
110 }
111 tab.put("1.5", JDK5); // Make 5 an alias for 1.5
112 tab.put("1.6", JDK6); // Make 6 an alias for 1.6
113 tab.put("1.7", JDK7); // Make 7 an alias for 1.7
114 tab.put("1.8", JDK8); // Make 8 an alias for 1.8
115 tab.put("1.9", JDK9); // Make 9 an alias for 1.9
116 tab.put("1.10", JDK10); // Make 10 an alias for 1.10
117 // Decline to make 1.11 an alias for 11.
118 }
119
120 private Source(String name) {
121 this.name = name;
122 }
123
124 public static final Source MIN = Source.JDK7;
125
126 private static final Source MAX = values()[values().length - 1];
127
128 public static final Source DEFAULT = MAX;
129
130 public static Source lookup(String name) {
131 return tab.get(name);
132 }
133
134 public boolean isSupported() {
135 return this.compareTo(MIN) >= 0;
136 }
137
138 public Target requiredTarget() {
139 if (this.compareTo(JDK12) >= 0) return Target.JDK1_12;
140 if (this.compareTo(JDK11) >= 0) return Target.JDK1_11;
141 if (this.compareTo(JDK10) >= 0) return Target.JDK1_10;
142 if (this.compareTo(JDK9) >= 0) return Target.JDK1_9;
143 if (this.compareTo(JDK8) >= 0) return Target.JDK1_8;
144 if (this.compareTo(JDK7) >= 0) return Target.JDK1_7;
145 if (this.compareTo(JDK6) >= 0) return Target.JDK1_6;
146 if (this.compareTo(JDK5) >= 0) return Target.JDK1_5;
147 if (this.compareTo(JDK1_4) >= 0) return Target.JDK1_4;
148 return Target.JDK1_1;
149 }
150
151 /**
152 * Models a feature of the Java programming language. Each feature can be associated with a
153 * minimum source level, a maximum source level and a diagnostic fragment describing the feature,
154 * which is used to generate error messages of the kind {@code feature XYZ not supported in source N}.
155 */
156 public enum Feature {
157
158 DIAMOND(JDK7, Fragments.FeatureDiamond, DiagKind.NORMAL),
159 MODULES(JDK9, Fragments.FeatureModules, DiagKind.PLURAL),
160 EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES(JDK9, Fragments.FeatureVarInTryWithResources, DiagKind.PLURAL),
161 DEPRECATION_ON_IMPORT(MIN, JDK8),
162 POLY(JDK8),
163 LAMBDA(JDK8, Fragments.FeatureLambda, DiagKind.PLURAL),
164 METHOD_REFERENCES(JDK8, Fragments.FeatureMethodReferences, DiagKind.PLURAL),
165 DEFAULT_METHODS(JDK8, Fragments.FeatureDefaultMethods, DiagKind.PLURAL),
166 STATIC_INTERFACE_METHODS(JDK8, Fragments.FeatureStaticIntfMethods, DiagKind.PLURAL),
167 STATIC_INTERFACE_METHODS_INVOKE(JDK8, Fragments.FeatureStaticIntfMethodInvoke, DiagKind.PLURAL),
168 STRICT_METHOD_CLASH_CHECK(JDK8),
169 EFFECTIVELY_FINAL_IN_INNER_CLASSES(JDK8),
170 TYPE_ANNOTATIONS(JDK8, Fragments.FeatureTypeAnnotations, DiagKind.PLURAL),
171 ANNOTATIONS_AFTER_TYPE_PARAMS(JDK8, Fragments.FeatureAnnotationsAfterTypeParams, DiagKind.PLURAL),
172 REPEATED_ANNOTATIONS(JDK8, Fragments.FeatureRepeatableAnnotations, DiagKind.PLURAL),
173 INTERSECTION_TYPES_IN_CAST(JDK8, Fragments.FeatureIntersectionTypesInCast, DiagKind.PLURAL),
174 GRAPH_INFERENCE(JDK8),
175 FUNCTIONAL_INTERFACE_MOST_SPECIFIC(JDK8),
176 POST_APPLICABILITY_VARARGS_ACCESS_CHECK(JDK8),
177 MAP_CAPTURES_TO_BOUNDS(MIN, JDK7),
178 PRIVATE_SAFE_VARARGS(JDK9),
179 DIAMOND_WITH_ANONYMOUS_CLASS_CREATION(JDK9, Fragments.FeatureDiamondAndAnonClass, DiagKind.NORMAL),
180 UNDERSCORE_IDENTIFIER(MIN, JDK8),
181 PRIVATE_INTERFACE_METHODS(JDK9, Fragments.FeaturePrivateIntfMethods, DiagKind.PLURAL),
182 LOCAL_VARIABLE_TYPE_INFERENCE(JDK10),
183 VAR_SYNTAX_IMPLICIT_LAMBDAS(JDK11, Fragments.FeatureVarSyntaxInImplicitLambda, DiagKind.PLURAL),
184 IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8),
185 SWITCH_MULTIPLE_CASE_LABELS(JDK12, Fragments.FeatureMultipleCaseLabels, DiagKind.PLURAL),
186 SWITCH_RULE(JDK12, Fragments.FeatureSwitchRules, DiagKind.PLURAL),
187 SWITCH_EXPRESSION(JDK12, Fragments.FeatureSwitchExpressions, DiagKind.PLURAL),
188 RAW_STRING_LITERALS(JDK12, Fragments.FeatureRawStringLiterals, DiagKind.PLURAL);
189
190 enum DiagKind {
191 NORMAL,
192 PLURAL;
193 }
194
195 private final Source minLevel;
196 private final Source maxLevel;
197 private final Fragment optFragment;
198 private final DiagKind optKind;
199
200 Feature(Source minLevel) {
201 this(minLevel, null, null);
202 }
203
204 Feature(Source minLevel, Fragment optFragment, DiagKind optKind) {
205 this(minLevel, MAX, optFragment, optKind);
206 }
207
208 Feature(Source minLevel, Source maxLevel) {
209 this(minLevel, maxLevel, null, null);
210 }
211
212 Feature(Source minLevel, Source maxLevel, Fragment optFragment, DiagKind optKind) {
213 this.minLevel = minLevel;
214 this.maxLevel = maxLevel;
215 this.optFragment = optFragment;
216 this.optKind = optKind;
217 }
218
219 public boolean allowedInSource(Source source) {
220 return source.compareTo(minLevel) >= 0 &&
221 source.compareTo(maxLevel) <= 0;
222 }
223
224 public boolean isPlural() {
225 Assert.checkNonNull(optKind);
226 return optKind == DiagKind.PLURAL;
227 }
228
229 public Fragment nameFragment() {
230 Assert.checkNonNull(optFragment);
231 return optFragment;
232 }
233
234 public Fragment fragment(String sourceName) {
235 Assert.checkNonNull(optFragment);
236 return optKind == DiagKind.NORMAL ?
237 Fragments.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
238 Fragments.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
239 }
240
241 public Error error(String sourceName) {
242 Assert.checkNonNull(optFragment);
243 return optKind == DiagKind.NORMAL ?
244 Errors.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
245 Errors.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
246 }
247 }
248
249 public static SourceVersion toSourceVersion(Source source) {
250 switch(source) {
251 case JDK1_2:
252 return RELEASE_2;
253 case JDK1_3:
254 return RELEASE_3;
255 case JDK1_4:
256 return RELEASE_4;
257 case JDK5:
258 return RELEASE_5;
259 case JDK6:
260 return RELEASE_6;
261 case JDK7:
262 return RELEASE_7;
263 case JDK8:
264 return RELEASE_8;
265 case JDK9:
266 return RELEASE_9;
267 case JDK10:
268 return RELEASE_10;
269 case JDK11:
270 return RELEASE_11;
271 case JDK12:
272 return RELEASE_12;
273 default:
274 return null;
275 }
276 }
277 }